I really don't think 4 lane highways are stopping deer genetics from spreading. Even if doe groups didn't routinely cross, I can guarantee you bucks would cross highways during the rut (and therefore spread genetics from one side to the other).
but whatever trait or gene that is being passed along that triggers doe estrous timing can only be passed on from female to female……That is the only way things could work out the way we see it happening. A doe that has a late Jan estrous date will have a daughter with a late Jan estrous date no matter which buck she is bred by…
That is not true at all. The buck is 50% of the genetics, plain and simple. That's like saying a 175" buck's male offspring will have 175" of antler potential no matter who the mother is. If doe genetics can influence buck antler size then buck genetics can influence doe estrous dates.